4
C. Manually close the valve; loosen the screw on the Closing Cam; in the direction of valve closing, to
rotate the cam until a “crack” sound is heard, fasten the screws on the cam.
D. Manually open the valve, making the Closing Cam to be away from micro switch’s contact. Then,
electrically close the valve to check if valve’s closing position is precise. With a precise limit position and a
sensitive control, user can fasten the screw on the Closing Cam. Loosening the screw is forbidden.(To
adjust the cam if there is error with valve’s closing position and repeatedly check until requirement is met.)
Adjustment for the closing position of valve.
E. Manually operate the valve to the fully open position and unscrew the screw on the Open Cam; turn the
cam to contact micro switch in the direction of opening valve as long as a “crack” sound is heard, user can
fasten screw. (The steps below are the same with “D” and be care of the direction.)
F. Electrically operate the valve for one stroke to make sure the controlling is in good condition. Check
again if the screws on the cams are fastened firmly. Till now, adjustment for open stroke and closing stroke
are finished. (See Fig.1)
3.2Adjustment for the pointer and potentiometer
A. When the valve is at a limit position, unscrew the pointer’s screws to have it pointed at the
corresponding scale and then fasten the screw. See Fig.1
B. When the valve is at a limit position(fully open or closed), uplift the potentiometer’s gear to make it to
be separated. Then, fasten the screws; rotate the potentiometer to the corresponding valve position
(potentiometer rotates to the end position) and go back a little. Unscrew the screw on the potentiometer’s
gear and make it to be meshed. To confirm it is meshed before fasten the screw.(Take care of the limit
position ,or it would be damaged.)
3.3Adjustment for the mechanical limit screws
A. To make sure in which valve position the screw limits before adjusting the mechanical limit screw.
While turning the valve right is to close, the limit screw on the right side is closing limit and the limit screw
on the left side is open limit.
B. When the valve is adjusted on a limit position, rotate the screws inward until it touches the upper part of
the driving shaft, and then, rotate back for 0.5-1 turn. Finally, fasten the outside screw and nut. Till now,
adjustment for mechanical limit is finished.
4. Additional Instruction for Explosion-proof product
4.1 Instruction for explosion-proof type
QBR3Ex-QBR5Ex series explosion-proof type is produced on the basis of GB3836.1-2010
《
General
Requirement for the Equipment Used in Explosive Environment, Part I
》
and GB3836.2-2010
《
The
Equipment Protected by Explosion-proof Enclosure “d” Used in Explosive Environment, PartII
》
.
Meanwhile, this series have been tested, experimented and finally verified by the national verified
explosion-proof organization and get Conformity Certificate of Explosion-Proof.
The explosion-proof grade of QBR explosion-proof type is Ex d II B T4 Gb. Ex d II B T4 Gb---Class
IIB, Temperature T4,Electrical apparatus. The sign “Ex” shows that the electric apparatus comply with the
Explosion-proof Standard; “d” shows that the explosion-proof type is enclosure explosion-proof; II class
represents that electric apparatus used in explosive gas environment except for gas made from coal; II B
represents that the gas is ethylene; T4 indicates that the permissible surface temperature is 135
℃
；
Gb is
apparatus protection degree.
There are 3 seating numbers and 6 types of this product: QBR3Ex
、
QBR3Ex.IN
、
QBR4Ex
、
QBR4Ex.IN
、
QBR5Ex
、
QBR5Ex.IN.
